Whedon 1.8 GPM Max flow rate Spray & Stream Aerator. It features an all brass swivel and dual thread connector, plastic spray body, and easy installation on most faucets. With 15/16"x27 male and 55/64"x27 female threads, it meets California Title 20 standard of 1.8 GPM max for kitchen faucets and is Lead-Free, complying with federal safe drinking water standards.